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Admins can specify the URL, name, and icon to be used for the enterprise
web store. The app itself is implemented as a component extension, with
some of the manifest values being specified by policy.

BUG=88464
TEST=New ComponentLoaderTest class added to unit_tests. Additional
manual testing: set "EnterpriseWebStoreURL" policy to a valid URL and
start up Chrome. Verify that there is an app on the new tab page that
links to the specified URL. If possible, try installing an extension from
somewhere on that URL, and ensure that no warning is shown before
showing the permission dialog.

Review URL: http://codereview.chromium.org/8477005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110698 0039d316-1c4b-4281-b951-d872f2087c98